<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>类选择器、ID选择器、</title>
		<style type="text/css">
			h3{
				color:orange;
			}
			p{
				font-size: 16px;
				color: red;
			}
			.writ{
				font-size: 25px;
				color: royalblue;
				}
				#ID属性名{
					color:purple ;
		</style>
	</head>
	<body>
		<h3>北京欢迎你</h3>
		<p>有梦想了不起</p>
		<p class="writ" id="ID属性名">有勇气就会有奇迹</p>
	</body>
</html>
